var oTou = document.getElementById("tou");
var aLli = oTou.getElementsByTagName("li");
var oTu = document.getElementById("tu");
var aSpan = oTou.getElementsByTagName("span");
var aDdiv = oTu.children;
for(var x=0;x<aLli.length;x++){
	aLli[x].llll=x;
	aLli[x].onmouseover=function(){
		for(var y=0;y<aDdiv.length;y++){
			aDdiv[y].style.display="none";
			aSpan[y].style.display="none";
		}
		aDdiv[this.llll].style.display="block";
		aSpan[this.llll].style.display="block";
	}
}
